Uppy info

Sleek, modular open source JavaScript file uploader

Uppy fetches files locally and from remote places like Dropbox or Instagram. With its seamless integration, reliability and ease of use, Uppy is truly your best friend in file uploading.

Sub-forum: Uppy - Transloadit Community
Code repo: GitHub - transloadit/uppy: The next open source file uploader for web browsers
Docs: Getting Started — Uppy
News feed: Uppy

I learned about Uppy as it is replacing jQuery functionality in Discourse: